[INFO] cloning repository https://github.com/gauravtanwar03/combiner-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/gauravtanwar03/combiner-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgauravtanwar03%2Fcombiner-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgauravtanwar03%2Fcombiner-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 47371c276ecab7f36c81f00e2cdeb359699fb91e
[INFO] checking gauravtanwar03/combiner-rs against master#bd71213cf0a765705e7d72a099151bd4eb465ccb for pr-123864
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgauravtanwar03%2Fcombiner-rs" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/gauravtanwar03/combiner-rs on toolchain bd71213cf0a765705e7d72a099151bd4eb465ccb
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+bd71213cf0a765705e7d72a099151bd4eb465ccb" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/gauravtanwar03/combiner-rs
[INFO] finished tweaking git repo https://github.com/gauravtanwar03/combiner-rs
[INFO] tweaked toml for git repo https://github.com/gauravtanwar03/combiner-rs written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/gauravtanwar03/combiner-rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+bd71213cf0a765705e7d72a099151bd4eb465ccb" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[ERROR] this task or one of its parent failed!
[ERROR] no output for 300 seconds
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.
[INFO] checking gauravtanwar03/combiner-rs against try#c0f799aeda763fc507814da0dc46c2dde7ca9133 for pr-123864
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgauravtanwar03%2Fcombiner-rs" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/gauravtanwar03/combiner-rs on toolchain c0f799aeda763fc507814da0dc46c2dde7ca9133
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c0f799aeda763fc507814da0dc46c2dde7ca9133" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/gauravtanwar03/combiner-rs
[INFO] finished tweaking git repo https://github.com/gauravtanwar03/combiner-rs
[INFO] tweaked toml for git repo https://github.com/gauravtanwar03/combiner-rs written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/gauravtanwar03/combiner-rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c0f799aeda763fc507814da0dc46c2dde7ca9133" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+c0f799aeda763fc507814da0dc46c2dde7ca9133" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 80afe5adba5a5243168398a69029a07beb0ef0c0be3bb95d8a1ea929a0ac0e3e
[INFO] running `Command { std: "docker" "start" "-a" "80afe5adba5a5243168398a69029a07beb0ef0c0be3bb95d8a1ea929a0ac0e3e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "80afe5adba5a5243168398a69029a07beb0ef0c0be3bb95d8a1ea929a0ac0e3e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "80afe5adba5a5243168398a69029a07beb0ef0c0be3bb95d8a1ea929a0ac0e3e", kill_on_drop: false }`
[INFO] [stdout] 80afe5adba5a5243168398a69029a07beb0ef0c0be3bb95d8a1ea929a0ac0e3e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+c0f799aeda763fc507814da0dc46c2dde7ca9133" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] eb3e4967ae592f4964a37c04bd170de4a1550aa6ceda5f58d2268c2c210a19e6
[INFO] running `Command { std: "docker" "start" "-a" "eb3e4967ae592f4964a37c04bd170de4a1550aa6ceda5f58d2268c2c210a19e6", kill_on_drop: false }`
[INFO] [stderr]     Checking combiner-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: fields `image_1`, `image_2`, and `output` are never read
[INFO] [stdout]  --> src/args.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct Args {
[INFO] [stdout]   |            ---- fields in this struct
[INFO] [stdout] 7 |     pub image_1 : String,
[INFO] [stdout]   |         ^^^^^^^
[INFO] [stdout] 8 |     pub image_2 : String,
[INFO] [stdout]   |         ^^^^^^^
[INFO] [stdout] 9 |     pub output : String,
[INFO] [stdout]   |         ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Args` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `image_1`, `image_2`, and `output` are never read
[INFO] [stdout]  --> src/args.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct Args {
[INFO] [stdout]   |            ---- fields in this struct
[INFO] [stdout] 7 |     pub image_1 : String,
[INFO] [stdout]   |         ^^^^^^^
[INFO] [stdout] 8 |     pub image_2 : String,
[INFO] [stdout]   |         ^^^^^^^
[INFO] [stdout] 9 |     pub output : String,
[INFO] [stdout]   |         ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Args` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.04s
[INFO] running `Command { std: "docker" "inspect" "eb3e4967ae592f4964a37c04bd170de4a1550aa6ceda5f58d2268c2c210a19e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eb3e4967ae592f4964a37c04bd170de4a1550aa6ceda5f58d2268c2c210a19e6", kill_on_drop: false }`
[INFO] [stdout] eb3e4967ae592f4964a37c04bd170de4a1550aa6ceda5f58d2268c2c210a19e6